Watch additional excerpts from our interview with Reverend Mary Holder Naegeli, who is among those urging the Presbyterian Church (USA) to resist changing its policies on same-sex marriage. "Homosexual practice is not God’s design for humanity," she says.

Episcopalians will debate a proposal that would allow churches to conduct same-sex weddings in the six states that have legalized gay marriage. Most mainline denominations don't officially allow same-sex weddings. But the changing legal situation is adding new pressure.